Argh! Ghost shifting is driving me crazy!

[jc031699]

Derailleur hanger
Sure you didn’t reverse the jockey wheel positions?


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[texbike]

Originally Posted by Ken Robb

It MUST be operator error!

Ken, it probably is!

Originally Posted by jc031699

Derailleur hanger
Sure you didn’t reverse the jockey wheel positions?

Defintely didn't reverse the jockey wheels on either derailleur that was tried, but thanks for the suggestion. Derailleur hanger will be checked soon.

Thanks!

[weisan]

Tex pal, I got a hangar alignment tool you can borrow if you need one.

[jamesau]

Originally Posted by texbike

Derailleur hanger will be checked soon.

Assuming it's replaceable, just buy a new hanger from Moots or Paragon Machine Works. (Not a bad thing to have a spare anyway...)

[NHAero]

Of the many things to check folks have generously suggested - which might cause the problem to be highly occasional? I have this problem on my Litespeed which has identical drivetrain to my Anderson except for an XT 11-40 cassette and a Wolftooth DM on the R8000 RD (RS685 hydro shifters, KMC 11 speed chain). The Litespeed has inline adjusters instead of barrel adjusters, I wonder if they lose their setting somehow and loosen the cable, but I've had the ghost shifting start up after a couple of almost no speed falls, both to the non-drive side, so no bending of the hanger.

[texbike]

Originally Posted by jamesau

Assuming it's replaceable, just buy a new hanger from Moots or Paragon Machine Works. (Not a bad thing to have a spare anyway...)

Hi James. This Moots is older and the hanger is non-replaceable. Great suggestion, though. Thank you.

Originally Posted by weisan

Tex pal, I got a hangar alignment tool you can borrow if you need one.

Wei, that's a great offer. Thank you! The hanger alignment will be next after trying a different (new Shimano) chain. I'm committed to identifying the specific issue so am making changes one at a time.

Texbike

[oldpotatoe]

Since ya have changed the entire drivetrain and shifter..kinda gotta be the frame...BUT hopefully, in changing so much, you haven't failed to identify the one thing that may be causing all this....As for a ti der hanger..it can be straightened if bent..

[texbike]

Originally Posted by oldpotatoe

Since ya have changed the entire drivetrain and shifter..kinda gotta be the frame...BUT hopefully, in changing so much, you haven't failed to identify the one thing that may be causing all this....As for a ti der hanger..it can be straightened if bent..

Thanks OP. Just to clarify, are you saying that a Ti hanger CAN or can't be straightened? Just want to make sure before I start messing with it.

Also, could loose housing ferrules have an effect?

Thanks,

Texbike

[oldpotatoe]

Originally Posted by texbike

Thanks OP. Just to clarify, are you saying that a Ti hanger CAN or can't be straightened? Just want to make sure before I start messing with it.

Also, could loose housing ferrules have an effect?

Thanks,

Texbike

Yes it can, just need to put some ooommph into it..done it many times..

[texbike]

Originally Posted by oldpotatoe

Yes it can, just need to put some ooommph into it..done it many times..

Great. Thanks for the clarification!

[kppolich]

Did you try the other shifter and RD yet?

[texbike]

Hmmm. I realized that I hadn't updated this thread.

I swapped out the new KMC 10v chain with a new Shimano Ultegra chain and the issue immediately went away without any additional adjustments. The bike has been riding along perfectly since then. I'm not sure what the issue with the chain was, but I wasn't able to find a sticky link on it. Perhaps the sticky lube that is on the new chains caused the issue? No telling... However, I do have another identical, new KMC chain that I'm going to swap out just to see if the issue reappears.

So.... a BIG thank you to everyone for your suggestions. I really appreciate your troubleshooting advice and guidance.

Cheers,

Texbike

[NHAero]

I haven't solved the periodic ghost shifting I reported on my Litespeed, but I have a new data point. In anticipation of D2R2, I moved the 11-40 cassette and the Wolftooth DM that enables the R8000 Ultegra derailleur to shift that cassette onto my Anderson. Same RS685 shifters and 11s KMC chain on both bikes. No ghost shifting on the Anderson.

I can get ghost shifting very occasionally on my Big Dummy and a re-setting of the cable tension on the stand solves it for months going forward. The one thing the Big Dummy and the Litespeed have in common is that they both have in-line cable tension adjusters. They're aluminum body, I think they may be YPK. Could the in-line adjusters be the issue? My other bikes have frame mounted adjusters.